Yazar "Muratcobanoglu, Fatma" seçeneğine göre listele

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    Biogas Upgrade Techologies And Biomethane Utulization Oportunities
    (Mehmet Sinan Bilgili, 2022) Muratcobanoglu, Hamdi; Mert, Ruhullah Ali; Muratcobanoglu, Fatma; Gokcek, Oznur Begum; Demirel, Sevgi
    The increase at the waste generation and energy demand still remain as a problem to be solved. Anaerobic digestion has a great importance in the term of waste reduction and renewable energy production as a green solution. Methane content of the biogas expresses the energy content and the potential. Removing impurities like CO2 H2S siloxane etc. and increasing the methane content of the biogas is allowing biomethane for further usage. Biomethane can be used as vehicle fuel (diesel replacement), gas grid injection (natural gas replacement), usage as a raw material for ethanol, dimethlyether etc. production other than electricity and heat generation. In this study, biogas upgrade technologies like pressure swing adsorption, membrane processes, scrubbing processes, cryogenic separation and biomethane utilization opportunities in the term of in-situ and ex-situ usage have been reviewed. In addition, the potential utilization areas of biomethane and specific requirements based on biogas quality are investigated comprehensively.
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    Biomethane enhancement using reduced graphene oxide in anaerobic digestion of municipal solid waste
    (Elsevier Sci Ltd, 2022) Muratcobanoglu, Hamdi; Gokcek, Oznur Begum; Muratcobanoglu, Fatma; Mert, Ruhullah Ali; Demirel, Sevgi
    The present research investigated the impact of reduced graphene oxide (rGO) addition on the semi-continuous anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) in the range of 0.5-10 gVolatileSolid(VS)/L(reactor)day organic loading rates (OLR). Adding rGO enhanced the rate and yield of biomethane production, and the maximum biomethane increment rate was obtained as 110% at an OLR of 4.0 gVS/L(reactor)day. However, after increasing the OLR to 6 gVS/L(reactor)day, there was a dramatic decrease in biomethane production because of volatile fatty acid (VFA) accumulation. Methanotrix is the predominant archaeal genus at OLRs lower than 6 gVS/L(reactor)day in reactors (89-97%). An increment in biomethane production was associated with the higher abundance of the Methanothrix genus in the rGO-supported reactor (rG) than in the control reactor (rC).
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    The effect of reduced graphene oxide addition on methane production from municipal organic solid waste
    (Wiley, 2021) Gokcek, Oznur B.; Muratcobanoglu, Fatma; Muratcobanoglu, Hamdi; Ucar, Deniz; Mert, Ruhullah A.; Yildirim, Bilal; Zan, Recep
    BACKGROUND Conductive materials have become the focus of recent studies to accelerate and stabilize the conversion of organic wastes to methane in anaerobic digestion processes. In this study, the effect of the addition of reduced graphene oxide (rGO) on biogas/biomethane production from municipal organic solid wastes in anaerobic batch reactors was investigated. In this context, the effect of loading ratios (0, 0.5, 1 and 2 gVS inoculum (gVS nutrient)(-1)) and rGO addition at different concentrations (0, 10, 20 and 30 mg L-1) was examined during a 45-day study period. RESULTS The highest biogas production reached a level of 816 +/- 14 mL (gVS)(-1) when substrate/inoculum ratio was 1 and 20 mg L-1 rGO was added (50% more than the group without rGO added). Addition of 30 mg L-1 rGO resulted in 667 +/- 12 mL (gVS)(-1) corresponding to 23% higher biogas production compared to the control reactor without rGO. The highest cumulative biomethane production was observed to be 525 +/- 20 mL (gVS)(-1) in the reactor with 20 mg L-1 rGO added in which substrate/inoculum ratio was 1. In the reactors with 10 and 30 mg L-1 and without rGO addition biomethane productions were 448 +/- 21, 401 +/- 13 and 323 +/- 23 mL (gVS)(-1), respectively. CONCLUSIONS Results revealed that the addition of rGO increased biomethane production from municipal organic solid wastes. It is concluded that rGO addition has the potential to be applied for real-scale facilities within the scope of renewable energy production and circular economy. (c) 2021 Society of Chemical Industry